image is a derivative work of the following images: File:Simplified_spermatozoon_diagram.svg licensed with PD-user 2009-07-08T07:53:14Z LadyofHats 611x178
derivative work of the following images: File:Complete_diagram_of_a_human_spermatozoa_en.svg licensed with PD-user 2008-10-04T14:44:40Z Frogger3140 597x585
